Cell Theory and the Basic Unit of Life · NCERT Biology

What is the typical size range of a human Red Blood Cell (RBC)?

  1. 2-3 micrometers in diameter
  2. 7.0 micrometers in diameter
  3. 15-20 micrometers in diameter
  4. 100 micrometers in diameter
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Correct answer: 7.0 micrometers in diameter

Human red blood cells are consistently about 7.0 micrometers in diameter. Their small size and biconcave shape help them navigate through narrow capillaries.

Difficulty: Medium Question 8 of 20

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